package com.example.thread2.thread3;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 优先级
 */
public class SimplePriorities implements Runnable{
    private int countDown = 5;
    private volatile double d ;
    private int priority;
    public SimplePriorities(int priority){
        this.priority = priority;
    }
    public String toString(){
        return Thread.currentThread() + ": " + countDown;
    }

    @Override
    public void run() {
        Thread.currentThread().setPriority(priority);
        while (true){
            for(int i=1; i<100000; i++){
                d += (Math.PI + Math.E) / (double) i;
                if (i % 1000 == 0) {
                    Thread.yield();
                }
            }
            System.out.println(this);
            if(--countDown ==0)
                return;
        }
    }

    public static void main(String[] args) {
        ExecutorService exec = Executors.newCachedThreadPool();
        for(int i=0; i<5; i++)
            exec.execute(new SimplePriorities(Thread.MIN_PRIORITY));
        exec.execute(new SimplePriorities(Thread.MAX_PRIORITY));
        exec.shutdown();
    }
}
